The standard diameter cement anchor screw is coated with a blue Climaseal® coating to help rust resistance. The large diameter cement anchor screws are coated with a silver Climaseal® coating.
The 3/16” and 1/4” come in both a hex washer head and a flat Phillips countersunk head while the large diameter cement anchor screws come only with a hex washer head.
The diameter of the hole that needs to be drilled into the base material is slightly smaller than the designated diameter of the cement anchor screw being installed. The hole must be drilled with a carbide tipped bit that meets ANSI standards and is used in a hammer drill. The hammer drill must be set in the hammer and rotation mode. The hole tolerance is critical for the cement anchor screw to obtain minimum holding values in the cement.
|Diameter of Cement Screw Anchor||Diameter of Hole in Base Material|
The hole in the fixture being mounted to the masonry material must be larger than the designated diameter of the cement screw anchor being installed in order to ensure clearance for the tapping threads that will embed in the cement.
|Diameter of Cement Screw Anchor||Hole Size Fixture|
The hole must be drilled to a depth that is 1/4” deeper than the screw will penetrate the base material and is deep enough to meet minimum embedment requirements. This extra space at the bottom of the hole is important because it allows space for the dust created during the tapping process to fall into and out of the way to ensure proper installation.
The cement anchor screw must be embedded into the concrete a minimum of 1” in order to reach minimum holding values.
Cement anchor screws must not be embedded into the base material further than 1-3/4”. Deeper embedments will create installation problems as well as fastener failure. Installation in the hard abrasive base material may create installation problem at embedments less than maximum embedments.
The minimum length of cement anchor screw to use for any particular application is determined by adding the thickness of the material being fastened to the minimum embedment depth of 1”. The maximum screw that should be considered is determined by adding the thickness of the material being fastened plus the maximum embedment of 1-3/4”.
As with any anchoring project, it is important to keep safety in mind and follow instructions carefully. Always remember to wear safety goggles, handle all tools with extra care and follow all technical specifications. This article is meant to serve only as a basic explanation of concrete fasteners. Always refer to manufacturer's instructions or consult a contracting expert during any anchoring project.